外文翻译---ds18b20单总线数字温度计(编辑修改稿)

外文翻译---ds18b20单总线数字温度计(编辑修改稿)内容摘要：

s access to the 1byte upper and lower alarm trigger register allows the user to set the resolution of the temperaturetodigital conversion to 9, 10, 11 or 12 bits. The TH 、 TL and configuration registers are nonvolatile(EEPROM), so they will retain data when the device is powered down. Figure 1 block diagram of the DS18B20 DS18B20 ROM COMMANDS (1) SEARCH ROM [0F0H] When a system is initially powered up, the master must identify the ROM codes of all slave devices on the bus, which allows the master to determine the number of slaves and their device types. The master learns the ROM codes through a process of elimination that requires the master to perform a Search ROM cycle as many times as necessary to identify all of the slave’ s 64bit ROM devices. (2) READ ROM [55H] This mand can only be used when there is one slave on the bus. It allows the bus master to read the slave 64bit ROM code without using the Search ROM procedure. If this mand is used when there is more than one slave present on the bus, a data collision will occur when all the slaves attempt to respond at the same time. (3) MATCH ROM [55H] The match ROM mand followed by a 64bit ROM code sequence allows the bus master to address a specific DS18B20 on a multidrop or singledrop bus. Only the BS18B20 that exactly matches the 64bit ROM code sequence will respond to the function mand issued by the master, all other slaves on the bus will wait for a reset pulse. (4) SKIP ROM [0CCH] The master can use this mand to address all devices on the b。